Security advisory

{
  "id": "40e259ab4f906d2a7e3f798996adec325d6ec0e15f2ccd6888f6c5b3566a3e34",
  "url": "https://osv.dev/vulnerability/CVE-2020-26163",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-26163",
    "summary": "BigBlueButton Greenlight before 2.5.6 allows HTTP header (Host and Origin) attacks, which can result in Account Takeover if a victim follows a spoofed password-reset link.",
    "evidence": "osv:CVE-2020-26163",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-26163",
      "aliases": [
        "CVE-2020-26163"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/bigbluebutton/greenlight",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7411eba8e0feced5beb56bfd51a52c5a600ed6d9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigbluebutton:greenlight:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7411eba8e0feced5beb56bfd51a52c5a600ed6d9"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "release-2.5.6"
                  }
                ]
              }
            }
          ],
          "versions": [
            "release-2.5.5",
            "release-2.5.3",
            "release-2.5.2",
            "release-2.5.1",
            "release-2.5",
            "release-2.5-rc.1",
            "release-2.4.2-rc.1",
            "release-2.4.2",
            "release-2.4.1",
            "release-2.4-rc1",
            "release-2.4",
            "release-2.4-b3",
            "release-2.4-b2",
            "release-2.4-b1",
            "release-2.3.4",
            "release-2.3.3",
            "release-2.3.2",
            "release-2.3.1",
            "release-2.3.0",
            "release-2.2.3",
            "release-2.2.2",
            "release-2.2.1",
            "release-2.2.0",
            "release-2.1.3",
            "release-2.1.2",
            "release-2.1.1",
            "release-2.1.0",
            "release-2.0.9",
            "release-2.0.8",
            "release-2.0.7",
            "release-2.0.6",
            "release-2.0.5",
            "release-2.0.4",
            "release-2.0.3",
            "release-2.0.2",
            "release-2.0.1",
            "release-2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26163.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:56.017007542Z",
      "provider": "osv",
      "references": [
        "https://github.com/bigbluebutton/greenlight/releases/tag/release-2.5.6",
        "https://github.com/bigbluebutton/greenlight/pull/1543",
        "https://www.sakshamanand.com/host-header-injection-bigbluebutton/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-26163",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384054,
  "published_at": "2020-09-30T18:15:27.477+00:00"
}